Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Newmar Owner's Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 10-07-2015, 07:36 AM   #1
Senior Member
 
twojayhawks's Avatar
 
Join Date: Jul 2015
Location: Lenexa KS
Posts: 2,053
Using coach compressed air for tire inflation

We went north for 10 days and before returning I had to add air since temps were much cooler. I used my old compressor that I carry but I assume one can tap into the coach air system and use that also. Question I have is steer tires need 130 so PSI setting on filling system will have to be higher. As per the needle gauge on the dash primary & secondary tank seem to be set to about 125-130 max I doubt that would be high enough to fill. What source do you use to top off tires and if it's the on board compressor have you adjusted the regulator to make higher PSI? Thanks
__________________
Bill & Kelli 2015 Dutch Star 4366
2002 Safari Zanzibar 3906
1995 Fleetwood Bounder 36JD
twojayhawks is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 10-07-2015, 07:40 AM   #2
Senior Member
 
JohnBoyToo's Avatar
 
Monaco Owners Club
Join Date: May 2012
Location: DFW, Tex-US
Posts: 6,196
The one time I've needed air, I filled at the fuel stop... Flying J, while fuel prices are elevated a bit, real easy for air, etc...
__________________
'11 Monaco Diplomat 43DFT RR10R pushed by a '14 Jeep Wrangler JKU. History.. 5'ers: 13 Redwood 38gk(junk!), 11 MVP Destiny, Open Range TT, Winn LeSharo, C's, popups, vans, tents...
JohnBoyToo is offline   Reply With Quote
Old 10-07-2015, 08:03 AM   #3
Senior Member
 
PushedAround's Avatar
 
Tiffin Owners Club
Join Date: Sep 2012
Location: Ambler, PA
Posts: 2,853
Blog Entries: 7
Quote:
Originally Posted by twojayhawks View Post
We went north for 10 days and before returning I had to add air since temps were much cooler. I used my old compressor that I carry but I assume one can tap into the coach air system and use that also. Question I have is steer tires need 130 so PSI setting on filling system will have to be higher. As per the needle gauge on the dash primary & secondary tank seem to be set to about 125-130 max I doubt that would be high enough to fill. What source do you use to top off tires and if it's the on board compressor have you adjusted the regulator to make higher PSI? Thanks
Are you certain about that pressure? Most of us have weighed our coaches and run the tire pressure that the MFG recommends appropriate for that weight (per axle). That is usually less than 110 psi, and the onboard pump can easily supply that. If 130 psi is what you need, then there are small portable compressors that will get up to 150 psi.
__________________
Larry & Cheryl Oscar, Louie, Ranger & Henry (our Springers)
PushedAround is offline   Reply With Quote
Old 10-07-2015, 08:05 AM   #4
Senior Member
 
VP Chianese's Avatar
 
Thor Owners Club
Newmar Owners Club
Freightliner Owners Club
Join Date: Oct 2014
Location: FL
Posts: 1,286
Quote:
Originally Posted by twojayhawks View Post
We went north for 10 days and before returning I had to add air since temps were much cooler. I used my old compressor that I carry but I assume one can tap into the coach air system and use that also. Question I have is steer tires need 130 so PSI setting on filling system will have to be higher. As per the needle gauge on the dash primary & secondary tank seem to be set to about 125-130 max I doubt that would be high enough to fill. What source do you use to top off tires and if it's the on board compressor have you adjusted the regulator to make higher PSI? Thanks
Get it weighed. You will find that your steer pressures will be closer to 110-115 and your rears will be 85-90.

That being said the coach will supply about 120 but you will have sore arms from holding the hose on the valve for the time it will take to get to 115 lbs. in one tire let alone two.

Stop by a truck tire store or even a Cummins dealer and ask nicely. $20 tip and you can get everything right where you want it.

But weight the coach so you know what you have and use the Michelin tire pressure chart. 130 is the max for the max load and you aren't there. That is 9K plus on each steer which would be 18k for the front axle and you are probably under 8k per side. Use the highest number across the axle. So if one side is 8k and the other is 7.5k you would use the 8k number and thus 115-120 psi on both steer wheels.

The rears will be close to 8-9k per side on the dual. So if you share that between the two tires you are under the min weight and pressure on the chart. So the min recommended psi on that tire is 80 psi so 90 would be good and a little better fuel mileage.

Tags are going to be around 3.5k per side. 80 -90 psi.

These are the numbers for my coach a 2015 4369 so you should be close. Also if you call customer service at Newmar and give them your serial number they can give you the weights on each wheel the day it left the plant with full fuel.

Good luck.
__________________
Vinny, Sandy, JD (10.01.13 - 06.20.20) and our present Portuguese Water Dog "Viking"
2016 Dutch Star 4018 Newmar #605899
VP Chianese is offline   Reply With Quote
Old 10-07-2015, 08:14 AM   #5
Senior Member
 
GaryKD's Avatar
 
Newmar Owners Club
Join Date: Jul 2006
Location: Wellington, Florida
Posts: 13,599
Hi twojayhawks,
I have an 18 gallon tank and compressor in the basement. It provides 150 PSI at the hose. Bought a couple of long hoses. When the G'kids went with us I was the hit of the CG. Besides the coach and toad tires, that compressor would fill just about anything requiring air PSI in no time at all.
__________________
Gary
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
The Avatar Is Many Times Around The USA
Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours
GaryKD is offline   Reply With Quote
Old 10-07-2015, 08:36 AM   #6
Senior Member
 
Tony Lee's Avatar
 
Join Date: Sep 2012
Location: Tasmania now, USA/Canada/Alaska in April
Posts: 2,473
Quote:
$20 tip
What happened to "FREE AIR"

If your tyre pressures are 110psi or less, you can use the on-board system, but only by wasting air to force the compressor to kick back in once the tank pressure drops below your target tyre pressure. Then you get a bit of time to feed in air before having to repeat the process. Bit of a pain but doable.

Never going to hurt to drive for a few miles until you get to a truck stop, but of course then you will have to allow for the increase in tyre pressure from heat induced by driving.
__________________
Tony Lee - International Grey Nomad. Picasa Album - Travel Map
RVs. USA - Airstream Cutter; in Australia - MC8 40' DIY Coach conversion & OKA 4x4 MH; in Germany - Hobby Class C; in S America - F350 with 2500 10.6 Bigfoot camper
Tony Lee is offline   Reply With Quote
Old 10-07-2015, 09:18 AM   #7
Senior Member
 
Sidewinder4's Avatar
 
National RV Owners Club
Join Date: Oct 2014
Posts: 520
Strongly recommend this product. RV'ing is about convenience to:

http://www.amazon.com/VIAIR-Automati...air+compressor
__________________
Terry & Kathy
2012 Dutch Star DP 4346
Sidewinder4 is offline   Reply With Quote
Old 10-07-2015, 09:56 AM   #8
JC2
Senior Member
 
JC2's Avatar
 
Texas Boomers Club
Join Date: Dec 2003
Location: Mo/Texas
Posts: 3,555
We use a compressor like the one in the following link when it was sold by Sears(Craftsman). Pumps our front tires to 110 and the rears to 105 easily and stores in one of the outside compartments. I carry (2) 25ft ext cords and will fire up the genie for power if needed on the road and not already in a cg somewhere.
http://www.amazon.com/PORTER-CABLE-C...air+compressor
JC2 is offline   Reply With Quote
Old 10-07-2015, 12:11 PM   #9
Senior Member
 
twojayhawks's Avatar
 
Join Date: Jul 2015
Location: Lenexa KS
Posts: 2,053
Quote:
Originally Posted by JC2 View Post
We use a compressor like the one in the following link when it was sold by Sears(Craftsman). Pumps our front tires to 110 and the rears to 105 easily and stores in one of the outside compartments. I carry (2) 25ft ext cords and will fire up the genie for power if needed on the road and not already in a cg somewhere.
Amazon.com: PORTER-CABLE CMB15 150 PSI 1.5 Gallon Oil-Free Fully Shrouded Compressor: Home Improvement

Too funny that is exactly the old one I carry also. Except because it was Craftsman mine is red. If I only need to carry 110-120 in the steer tires this ought to work fine. Even though I had it regulated all the way up to 150 it still didn't quite have the guts to get me inflated to 130.
__________________
Bill & Kelli 2015 Dutch Star 4366
2002 Safari Zanzibar 3906
1995 Fleetwood Bounder 36JD
twojayhawks is offline   Reply With Quote
Old 10-07-2015, 02:32 PM   #10
Senior Member
 
Join Date: Feb 2010
Location: Claremore
Posts: 400
They do make a unit I believe is called a duplicator. It doubles whatever you put in 90 in 180 out. It is a little slower but effective. I would have called it a multiplier but I believe that the tech called a duplicator. It came with my first used coach.
I believe it would be cheaper to buy a compressor but this takes up a lot less room.
Steve Mosher
Smosher is offline   Reply With Quote
Old 10-07-2015, 02:39 PM   #11
Senior Member
 
Steve Ownby's Avatar
 
Join Date: Nov 2008
Location: Cosby, Tn
Posts: 6,587
Quote:
Originally Posted by Smosher View Post
They do make a unit I believe is called a duplicator. It doubles whatever you put in 90 in 180 out. It is a little slower but effective. I would have called it a multiplier but I believe that the tech called a duplicator. It came with my first used coach.
I believe it would be cheaper to buy a compressor but this takes up a lot less room.
Steve Mosher

I bought one of these from a guy who sold his coach. Bob Dickman Tire sells a model that is built into a Pelican case. They work great and are smaller than any heavy duty compressor.


Steve Ownby
Full time since '07
__________________
Steve Ownby
Full time since 2007
2003 Monaco Signature
Steve Ownby is offline   Reply With Quote
Old 10-07-2015, 02:43 PM   #12
Senior Member
 
wa8yxm's Avatar
 
Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
You really need closer to 150 PSI or more to inflate 130 PSI tires however... In an emergency I would not object to a slow low pressure run.. Just slow to the nearest Truck Stop .

There is I suspect a pressure multipler for air systems,, I mean the design is simple.. I just do not know where you might fine one.
__________________
Home is where I park it!
wa8yxm is offline   Reply With Quote
Old 10-07-2015, 03:01 PM   #13
Senior Member
 
twojayhawks's Avatar
 
Join Date: Jul 2015
Location: Lenexa KS
Posts: 2,053
Quote:
Originally Posted by VP Chianese View Post
Get it weighed. You will find that your steer pressures will be closer to 110-115 and your rears will be 85-90.

That being said the coach will supply about 120 but you will have sore arms from holding the hose on the valve for the time it will take to get to 115 lbs. in one tire let alone two.

Stop by a truck tire store or even a Cummins dealer and ask nicely. $20 tip and you can get everything right where you want it.

But weight the coach so you know what you have and use the Michelin tire pressure chart. 130 is the max for the max load and you aren't there. That is 9K plus on each steer which would be 18k for the front axle and you are probably under 8k per side. Use the highest number across the axle. So if one side is 8k and the other is 7.5k you would use the 8k number and thus 115-120 psi on both steer wheels.

The rears will be close to 8-9k per side on the dual. So if you share that between the two tires you are under the min weight and pressure on the chart. So the min recommended psi on that tire is 80 psi so 90 would be good and a little better fuel mileage.

Tags are going to be around 3.5k per side. 80 -90 psi.

These are the numbers for my coach a 2015 4369 so you should be close. Also if you call customer service at Newmar and give them your serial number they can give you the weights on each wheel the day it left the plant with full fuel.

Good luck.
Thanks for all the good info. I was remiss in getting weighed but I'll make time for it soon
__________________
Bill & Kelli 2015 Dutch Star 4366
2002 Safari Zanzibar 3906
1995 Fleetwood Bounder 36JD
twojayhawks is offline   Reply With Quote
Old 10-07-2015, 04:13 PM   #14
Senior Member
 
Gordon Dewald's Avatar
 
Winnebago Owners Club
Join Date: Mar 2014
Posts: 14,885
Our tire pressures are 110, 90, 80. Carry a porter cable pancake compressor. Works well. Space is not an issue.
__________________
Gordon and Janet
Tour 42QD/InTech Stacker
Gordon Dewald is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
How I winterized the water system on my coach GlennLever Class A Motorhome Discussions 18 12-02-2014 02:42 AM
Air Leveling on 2000 Country Coach does not auto adjust after engine cut off Affinityfan RV Systems & Appliances 2 03-29-2014 07:54 PM
Dump air - level coach - extend slides... What order? prwa330 Monaco Owner's Forum 44 11-24-2013 10:44 AM
Air Bag inflation cochese Class A Motorhome Discussions 6 10-22-2013 09:34 AM
Freightliner Compressed air system Drain Lanyard adonh Freightliner Motorhome Chassis Forum 14 09-27-2013 03:25 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 04:54 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.